a) Which one of the following queries finds sailors who have reserved at least a boat but not a red boat? Query1: SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color<>’red’ Query2: SELECT R.sid FROM Reserves R EXCEPT SELECT R.sid FROM Boats B, Reserves R WHERE B.bid=R.bid AND B.color=’red’   b) What are the results of query1 and query2 in part A, considering the following instances of Sailors and Reserves tables? (images attached)

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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a) Which one of the following queries finds sailors who have
reserved at least a boat but not a red boat?

Query1:
SELECT R.sid
FROM Boats B, Reserves R
WHERE B.bid=R.bid AND B.color<>’red’


Query2:
SELECT R.sid
FROM Reserves R
EXCEPT
SELECT R.sid
FROM Boats B, Reserves R
WHERE B.bid=R.bid AND B.color=’red’

 

b) What are the results of query1 and query2 in part A,
considering the following instances of Sailors and Reserves tables? (images attached)

SID BID
1
1
3
101
3 102
3 103
101
104
DAY
10-OCT-17
10-OCT-19
10-JUL-19
10-OCT-18
07-NOV-17
BID
BNAME
101 Interlake
102
Interlake
103
Clipper
104 Marine
COLOR
blue
red
green
red
Transcribed Image Text:SID BID 1 1 3 101 3 102 3 103 101 104 DAY 10-OCT-17 10-OCT-19 10-JUL-19 10-OCT-18 07-NOV-17 BID BNAME 101 Interlake 102 Interlake 103 Clipper 104 Marine COLOR blue red green red
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